Improvement in rock-drills



R. FLETCHER.

Ruck-Drills.

Patented May 19, 1874.

Int/*anion (l/DM. 4/l @Ma/'ggf UNITED STATES- PATENT OFFICE.

ROBERT FLETCHER, OF BROOKFIELD, OHIO.

IMPROVEMENT IN RCKDRILLS.

Specification forming part of Letters Patent No. l 51, 112, dated May 19, 1874; application filed April 8, 1,374.

To all whom it may concern:

Be it known that I, ROBERT FLETCHER., of Brookfield, in the county of Trumbull and State of Ohio, have invented a certain new and Improved Coal and Rock Drill, of which the following is a full, clear, and complete description, reference being had to the accom- Of the construction and operation of the above-specified invention, the following` is a more full and complete description.

Figures 1 and 2 are side views of the drill. Fig. 3 is a top view. Figs. 4 and 5 are detached sections.

Like letters of reference refer to like parts -in the several views.

In the drawings, A represents the drill post or stanchion, to which the drilling apparatus is secured. Said apparatus consists of a twopart nut, A', of which B O are the sections. 1n the nut is ltted the feed-screw D operated by a handle, E. The two parts of the nut are held together by a yoke, F, Fig. 1, and drawkey G. From one arm of the yoke projects a shaft, H, Fig. 3, which has its bearings in one side of the clamp I, whereby said nut and screw are fastened to the stanchions by means of the hand-nuts J, as shown in the drawings. To the top of the stanchion is fitted a cap, K, which is secured thereto by the screws L. From two sides of the cap K project lugs M, in which are tted the adjustingscrews N, the purpose of which will present-lybe shown. At the end of the feed-screw D, above referred to, is secured a head, O, in which is inserted the bifurcatedendP of the drill. The branches ot' the bifurcation t around the form Q, Fig. 5, of the head, thereby holding the head securely from vibration in direction of the line a: x, while the sides a b, Fig. 2, hold it from vibrating sidewise. This manner of holding the end of the drill in the head allows of 11o dirt to accumulate in the head, and prevent the end of the drill from tting snugly and securely therein, but which frequently occurs in the ordinary socket-head. The socket becomes charged with dirt, so that the shank of the drill will not properly enter, hence it requires to be often cleaned out to allow the shank to enter the socket.

The operation of the above-described drill is as follows: The post or stanchion A is set upright in the mine, in which position it is maintained by the screws Nforced upward against the ceiling. The two screws not only prevent the post from falling over, but they also prevent it from turning round in consequence of the pressure exerted upon it in the process of drilling. The two screws being of considerable length, the post can be adjusted to variable heights of the mine, and thereby avoid the trouble of changing the post for a longer or shorter one, as the case may be.

By means `of the clamp I, the drill can-be raised or lowered for drilling at any altitude in the wall, and for reason of the nut being journaled in the clamp, it can be directed to any an gle for drilling either above or below a horizontal line.

It will be observed that the drilling is done by the drill R, and that the feeding of the same is effected by the screw D operated by the adjustable handle E, which, for convenience, is not iixed to the screw, but simply run through the eye therein, so that it can be lengthened or shortened, as the space around it or other circumstance may require a long or short crank.

Vha-t I claim as lny invention, and desire to secure by Letters Patent, isi The nut A', screw D, yoke F, key G, shaft H, and clamp I, in combination with the post A, substantially in the manner as and for the purpose set forth.

ROBERT FLETCHER.

Witnesses J. H. BUERIDGE, A. F. CORNELL. 

